Insert Media not working

Our site was working fine fot more than a year bur suddenly we are not able to upload any image to the gallery.

Click on add slides open the insert media but the gallery doesn’t show any image and the animation spins forever.

Uploading a new file finish with an error when trying to display the image into the gallery, curiously checking the multimedia gallery the images appears.

I have tried deactivating all plugins, but inpost gallery but the problem remains.

Any ideas?

This is a major concern for us

Thanks

https://www.ads-software.com/plugins/inpost-gallery/